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Demographic characteristics of participants
| Characteristic | Mean±SEM/N (%) |
|---|---|
| Age | 31.4±1.3 |
| Years of education | 9.2±0.5 |
| Dose used (g/day) | 0.6±0.1 |
| Duration of heroin use (years) | 7.1±0.8 |
| Months since last heroin use | 3.9±0.3 |
| Marital status/N (%) | |
| Married or cohabiting | 9/42.9 |
| Separated or divorced | 2/9.5 |
| Never married | 10/47.6 |
